Not..quite
The Aztec religion is not a solar religion, as say, the worship of Aten is solar worship. The Aztecs had a pantheon of gods, albeit extremely different from European or Vedic pantheons, yet in other ways very similar. For a look into Aztec gods go here:
http://www.godchecker.com/database/all-aztec-gods.php
The Mayans however, there was an odd bird religiously. Unlike the Aztecs, who adopted comfortable anthropomorphic deities, the Mayans worshipped cosmic unknowable forces of the universe personified into various forms that they wore as humans would put on a new coat. They never, I might add, personified as humans, but rather as monsters straight out of Godzilla.
In EU2 there are only one group of sun worshippers in the whole world, and they are portrayed as Hindu. The Rajputs.